JP2024098441A - Manufacturing method for precious metal ornaments and precious metal ornaments manufactured by said manufacturing method - Google Patents

Abstract

To provide a manufacturing method of a noble metal ornament that enables designs of a plurality of noble metal ornaments manufactured in one time to be varied and enables a degree of freedom of design selection by a purchaser side to be increased, and a noble metal ornament manufactured by the manufacturing method.SOLUTION: A method of manufacturing a noble metal ornament includes: a wax prototype manufacturing step of manufacturing a wax prototype having the same shape as that of a base material of the ornament by using a sealing stamp; a step of creating a gypsum mold by pouring gypsum into a part around the wax prototype, curing the gypsum, then sintering the gypsum, and evaporating the wax prototype; and a step of pouring a material to be the base material into a cavity in the gypsum mold and curing the material.SELECTED DRAWING: Figure 1

Description

The present invention relates to a method for manufacturing precious metal ornaments that have a base material of precious metal and can be used for a wide range of applications, such as accessories and interior decorations, and to precious metal ornaments manufactured by this manufacturing method.

Conventionally, the so-called lost wax method is known as a method for manufacturing ornaments made of precious metals (see Prior Art Document 1 below). A general lost wax method is described below with reference to Figures 7 to 9. First, a master model 102 made of a precious metal such as gold, silver, or platinum is prepared (step S201), and placed in a silicone rubber mold (hereinafter referred to as a "rubber mold") 103 of a predetermined shape (see Figure 8 (a)). After the rubber mold 103 is hardened, it is split (cut) in two and the master model 102 is removed, forming a cavity 130 in the rubber mold 103 that corresponds to the master model 102, and the rubber mold 103 for creating a wax master model (wax master model) of an ornament is created (step S202, see Figure 8 (b)). The two cut-cut rubber molds 103, 103 are again matched, and the cavity 130 in the rubber mold 103 is filled with melted wax to create a wax master model of an ornament 104 (step S203).

The molded wax model 104 of the ornament is fused to the wax base (pillar) 106 in a tree shape and connected (step S204, see FIG. 8(c)), and the tree-shaped connecting body is inserted into a predetermined base material (for example, a mold with a cylindrical or rectangular pipe installed on a base) 150 and made to stand (step S205). The base material 150 is filled with gypsum material and hardened (step S206), and then fired in a furnace or the like (step S207) to melt the tree-shaped connecting body and create a gypsum mold (casting mold) with a cavity (casting gap) 140 corresponding to the tree-shaped connecting body (see FIG. 9(a)). Molten metal containing the desired metal is poured into this gypsum mold, and after sufficient solidification, the gypsum mold is destroyed to extract the tree-shaped metal connecting body 155 corresponding to the tree-shaped connecting body (step S208, see FIG. 9(b)). Individual ornaments 160 are cut off from the tree-shaped metal connecting body 155. Each separated decorative item 160 is subjected to appropriate surface treatment such as polishing (step S209) to obtain the final product (decorative item after surface treatment).

JP 2004-135714 A

The method for manufacturing the above-mentioned precious metal ornaments involves preparing a precious metal master model, placing it in a rubber mold, removing the master model and filling the cavity with molten wax to create a wax master model, and repeating this process to create multiple wax master models of the same shape to create a tree-shaped plaster mold. Therefore, only one type of precious metal ornament can be produced in one production run. When manufacturing other types of precious metal ornaments, a wax master model of a different shape must be prepared and a tree-shaped plaster mold must be created according to the above process.

Incidentally, in recent years, there has been an increase in sales formats that incorporate a DIY feel into the manufacturing process to sell products tailored to the individual needs of the consumer. However, in the world of jewelry made from precious metals, the prototypes for the precious metals are generally designed by the manufacturer, meaning that the design options available to the buyer are limited and the buyer has little freedom in choosing the design.

Therefore, the object of the present invention is to provide a method for manufacturing ornaments made of precious metals that can vary the designs of multiple ornaments made of precious metals produced in a single production run and that can increase the freedom of design selection for purchasers, and to provide ornaments made of precious metals produced by said method.

In one embodiment, a method for manufacturing an ornament made of a precious metal includes a wax prototype manufacturing process in which a wax prototype having the same shape as the base material of the ornament is manufactured using a sealing stamp, a process in which plaster is poured around the wax prototype, hardened, and then baked to evaporate the wax prototype to create a plaster mold, and a process in which the material to be the base material is poured into the cavity in the plaster mold and hardened.

In the method for manufacturing an ornament made of a precious metal according to the above-mentioned embodiment, the wax prototype manufacturing process preferably includes a wax injection process in which wax is injected onto a sheet using a wax injection device into which wax has been inserted, and a wax prototype creation process in which a sealing stamp is brought into contact with the wax on the sheet, and after a predetermined time has elapsed, the sealing stamp is removed to create a wax prototype.

In the method for manufacturing an ornament made of a precious metal according to the above-mentioned embodiment, in the wax injection step, the wax is preferably injected so that the outer diameter of the wax injected onto the sheet is smaller than the outer diameter of the stamp portion of the sealing stamp.

In another embodiment, a method for manufacturing a precious metal ornament includes the steps of pouring plaster around a wax model, hardening it, and then baking it to evaporate the wax model to create a plaster mold, and pouring the material that will become the base material of the ornament into the cavity in the plaster mold and hardening it, and the wax model has the same shape as the base material and is manufactured using a sealing stamp.

In one embodiment, the precious metal ornament is preferably manufactured using the method for manufacturing the ornament described above.

It is possible to provide a method for manufacturing ornaments made of precious metals that can vary the designs of multiple ornaments made of precious metals produced in a single production run and that can increase the freedom of design selection for purchasers, as well as ornaments made of precious metals produced by said method.

1 is a flowchart for explaining an embodiment of a method for manufacturing an ornament made of precious metal according to the present invention. FIG. 1A is a diagram showing how a wax stick is inserted into a glue gun, and FIG. 1B is a diagram for explaining how glue is ejected from the glue gun. 13 is a diagram showing a state in which glue is ejected from a glue gun onto a sheet. FIG. 13 is a diagram for explaining how the outer diameter of the wax injected onto the sheet is made smaller than the outer diameter of the stamp portion of the sealing stamp. FIG. (a) is a diagram showing the state of the sealing stamp before it is pressed into the wax, (b) is a diagram showing the state of the sealing stamp when it is pressed into the wax, and (c) is a diagram showing the wax prototype of the decorative item. (a) is a diagram showing the state in which a wax model is welded and connected to a wax core in a tree shape, (b) is a diagram showing the state in which the inside of the pipe has been filled with gypsum material, (c) is a diagram showing a tree-shaped metal connector, and (d) is a diagram showing the decorative item after post-processing. 1 is a flowchart for explaining an example of a conventional method for manufacturing an ornament made of precious metal. 1A is a diagram showing a precious metal master mold placed in a rubber mold, FIG. 1B is a diagram showing a rubber mold with a cavity formed inside, and FIG. 1C is a diagram showing a tree-shaped connecting body. FIG. 1A shows a plaster mold having a cavity, and FIG. 1B shows the decorative article after post-processing.

Below, one embodiment of the method for manufacturing an ornament made of a precious metal according to the present invention will be described with reference to Figures 1 to 6. In this embodiment, the material constituting the ornament is silver (Ag), but the material constituting the ornament is not limited to silver (Ag) and may be, for example, a precious metal such as gold (Au) or platinum (Pt), or a metal such as aluminum (Al).

A thermoplastic rod (hereinafter referred to as "wax rod") 14 is inserted into the glue gun (wax injection device) 10, and power is supplied via the power cord 13 to raise the temperature of the nozzle (injection part) 11 of the glue gun 10 (step S101, see FIG. 2(a)). When the wax rod 14 begins to melt, the trigger 12 of the glue gun 10 is operated to push the nozzle 11 toward the sheet 20 to extrude the molten wax (resin) (step S102, see FIG. 2(b)). Note that the sheet 20 is preferably, for example, greaseproof paper (cooking sheet) treated with silicone resin, but is not limited to this as long as it is made of a material that makes it easy to peel off the wax. The injection amount and injection direction are adjusted so that the extruded wax 22 is circular on the sheet 20 (step S103, see FIG. 3). Note that it is preferable to adjust the outer diameter of the wax injected onto the sheet to be smaller than the outer diameter of the stamp part of the sealing stamp. The reason for this is that it is necessary to prevent the wax from protruding beyond the outer diameter of the stamp part as much as possible after pressing the sealing stamp. The less excess there is, the less time it takes for the post-processing (including surface processing and side processing) described below.

The sealing stamp 24, which has a stamp section 26 engraved with a specified design and a handle 28, is pressed vertically down into the wax 22 on the sheet (step S104, see Figures 5(a) and (b)). Note that the shape of the wax prototype 30 for the ornament will vary slightly depending on the pressure (pressure) applied by the sealing stamp 24 to the wax 22. Once the wax 22 has hardened a little, the sealing stamp 24 is removed from the wax 22 on the sheet, and the wax prototype 30 for the ornament is formed in the wax 22 (step S105, see Figure 5(c)).

A glue gun is a tool (wax injection device) that melts and glues rod-shaped thermoplastic (sticks), but a glue gun is not necessary if you can create molten wax. For example, you can place the thermoplastic on a spoon, heat the spoon, and drip the molten wax onto the sheet.

In principle, the sealing stamp 24 is pressed by the user (purchaser), but this is not limited to this. For example, the sealing stamp 24 may be pressed using a simple pressing device that can fix the sealing stamp and move it manually or automatically up and down to apply a specified pressure (press).

The molded wax model 30 for the ornament is fused to the wax core 50 in a tree-like shape using the wax material 31 (step S106, see FIG. 6(a)), and a tree-like connecting body (tree-like wax model) 45 is obtained. Next, a base material 40 is prepared to function as a plaster mold, for example, by placing a cylindrical pipe 70 on a base 60, and the tree-like connecting body 45 is inserted into the pipe 70 and made to stand (step S107, see FIG. 6(a)). Next, the pipe 70 is filled with plaster material 75, which is then left to harden for a predetermined period of time (step S108, see FIG. 6(b)), and then fired in a furnace or the like (step S109), and the tree-like connecting body 45 is melted to create a plaster mold (casting mold) having a cavity (casting gap) corresponding to the tree-like connecting body 45.

Molten metal containing dissolved silver is poured into the cavity inside this plaster mold, and after it has solidified sufficiently, the plaster mold is destroyed to extract tree-shaped metal connectors 95 corresponding to the tree-shaped connectors (step S110, see FIG. 6(c)). From the tree-shaped metal connectors 95, individual pre-processing ornaments 80 (processing including surface processing and side processing) are separated. The separated individual ornaments 80 are then subjected to appropriate post-processing such as polishing (step S111) to obtain the final product (post-processing ornament 85).

[effect]
According to the method for manufacturing a precious metal ornament in accordance with the embodiment described above, the shape of the wax model 30 for ornament varies subtly depending on the strength of the pressure applied by the sealing stamp 24 against the wax 22, and therefore the shape of the wax model 30 for ornament connected to the wax main body 50 varies, so that multiple precious metal ornaments made in one production can have different designs, and the freedom of design selection for the purchaser can be increased. Also, while multiple productions were required to obtain multiple ornaments with different designs as in the past, according to this embodiment, multiple ornaments with different designs can be obtained in one production, and the production time can be shortened.

The specific embodiment of the present invention has been described above, but the present invention is not limited to the above embodiment, and various modifications can be made within the scope of the present invention.

10 Glue gun (wax injection device)
11 Nozzle 12 Trigger (lever)
13 Power cord 14 Wax stick 20 Sheet 22 Wax 24 Sealing stamp 26 Stamp part 28 Handle 30 Decorative wax prototype 31 Wax material 40 Base material 45 Tree-shaped connector (tree-shaped wax prototype)
50 Main body 60 Base 70 Pipe 80 Decoration before post-processing 85 Decoration after post-processing 95 Tree-shaped metal connector

Claims (5)

A wax prototype manufacturing process in which a wax prototype having the same shape as the base material of the decorative item is manufactured using a sealing stamp;
A step of pouring plaster around the wax model, hardening it, and baking it to evaporate the wax model to create a plaster mold;
and pouring the material to be the base material into the cavity in the plaster mold and allowing it to harden. The wax prototype manufacturing process includes a wax injection process in which wax is injected onto a sheet by a wax injection device into which wax is inserted, and a wax prototype creation process in which the sealing stamp is brought into contact with the wax on the sheet, and after a predetermined time has elapsed, the sealing stamp is removed to create the wax prototype.
The method for manufacturing a precious metal product according to claim 1. In the wax injection step, the wax is injected so that the outer diameter of the wax injected onto the sheet is smaller than the outer diameter of the stamp portion of the sealing stamp.
3. The method for producing a precious metal product according to claim 2. A process of pouring plaster around the wax model, hardening it, and then baking it to evaporate the wax model to create a plaster mold;
and pouring a material to be the base material of the decorative article into the cavity in the plaster mold and allowing it to harden.
The wax model has the same shape as the substrate and is produced using a sealing stamp;
A method for manufacturing a precious metal product comprising the steps of: A precious metal product manufactured by the manufacturing method described in any one of claims 1 to 4.

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